Compensation Programs (Schedule Of Dividend Equivalent Rights) (Details) (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Related compensation costs	$ 232,000	$ 483,000
2008 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2008
Total Grant		225,000
Related compensation costs	90,000	187,000
2009 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2009
Total Grant		225,000
Related compensation costs	90,000	187,000
2010 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2010
Total Grant		60,000
Related compensation costs	24,000	50,000
2011 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		August 2011
Total Grant		72,000
Related compensation costs	$ 28,000	$ 59,000
2012 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2012
Total Grant		72,000